Creating and ordering grids

I want to create a two column 20x20 grid (x,y) with 0.2 resolution on specific orders. First I know how to create the grid by fixing y everytime and populating x as follows

 [y, x] = meshgrid(0:0.2:20);
 grid = [x(:) y(:)];

The first order I want the points to be in is starts at (0,0) then jumps 20 points on x at the time until the end of that line is reached, i.e. (0,0) (2,0) (4,0)...(20,0) then starts at (0,2) and do the same (0,2) (2,2) (4,2)...(20,2) That's repeated until y =20. The same process starts again but now at (0.2,0). I was able to do that using 4 for loops as follows

 grid=[];

 for j = 0:0.2:1.8
   for i = 0:0.2:1.8
      for v = j:2:20
         for u = i:2:20
             p = [u v];
             grid = [grid;p];
         end
      end
   end
end

This code does the trick, but is there a more efficient way of doing that?

Now we come to the second way I want to order the points. I haven't been able to do that yet. I want to the same order as the one above starting at but ends at (10,10). starts at y=0 (0,0) (2,0) (4,0)...(20,0). Then y=1 (0,1) (2,1) (4,1)...(20,1). Until y =10 you it stops at x = 10 (0,10) (2,10) (4,10)...(10,10). Next you start at (0.2,0) and do the same until (9.8,10) Then another grid (matrix) that starts at the top (20,20) and goes from left to right (opposite to the above) until it end at (10,10). E.g. y=20 (20,20) (18,20)...(0,20). Then y=1 (20,18) (18,18)...(0,18). y =10 (20,10) (18,10) (16,10)...(10,10)

In another word, doing the same order as the one above but with two matrices, one starts at (0,0) and the second starts at (20,20) and they both meet at (10,10)

[KSSV]

Jeez...very confusing......Wont this work?

[X,Y] = meshgrid(0:2:20) ;